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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
25. Jun. 2018 to 02. Jul. 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
OECD Guideline 115 dated 27. July 1995 “Surface tension of aqueous solutions“
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
EU-Method A.5 “Surface Tension” from 30. May 2008, published on 31 May 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
plate method
Specific details on test material used for the study:
No further details specified in the study report.
Key result
Surface tension:
>= 72.06 - <= 72.74 mN/m
Temp.:
20 °C
Conc.:
1.43 mg/L

Findings and Results

 

Findings Reference Test

Water, HPLC grade,I1020_6 was measured.

The following values were recorded:

 

Measured Values Negative Control

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

4.2

0.2981

72.72

21.2

2

5.1

0.2976

72.60

21.2

3

6.1

0.2973

72.53

21.2

4

7.2

0.2975

72.57

21.2

5

8.1

0.2972

72.50

21.2

6

9.1

0.2974

72.55

21.2

7

10.1

0.2972

72.50

21.2

8

11.1

0.2971

72.48

21.2

9

12.1

0.2973

72.53

21.2

10

13.1

0.2972

72.50

21.2

Mean

72.55

 

Standard Deviation

0.07

 

 

Findings Main Test

The test item solution was held at constant temperature (20.0 ± 0.2 °C). 60 minutes after conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following values were recorded:

 

Measured Values Test Item First Series

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

4.2

0.2982

72.74

20.2

2

5.1

0.2973

72.53

20.2

3

6.2

0.2972

72.50

20.2

4

7.1

0.2972

72.50

20.2

5

8.2

0.2971

72.48

20.2

6

9.1

0.2971

72.48

20.2

7

10.2

0.2970

72.45

20.2

8

11.1

0.2973

72.53

20.2

9

12.2

0.2969

72.43

20.2

10

13.1

0.2973

72.53

20.2

Mean

72.52

 

Standard Deviation

0.09

 

 

Measured Values Test Item Second Series

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

4.1

0.2974

72.55

20.0

2

5.1

0.2970

72.45

20.0

3

6.1

0.2968

72.40

20.0

4

7.1

0.2964

72.31

20.1

5

8.1

0.2967

72.38

20.1

6

9.1

0.2966

72.35

20.1

7

10.1

0.2966

72.35

20.1

8

11.2

0.2954

72.06

20.1

9

12.1

0.2965

72.33

20.1

10

13.1

0.2966

72.35

20.1

Mean

72.35

 

Standard Deviation

0.12

 

 

After the first and the second measurement series, the difference between mean values was less than 5%. Therefore no additional measurement series was required.

Conclusions:
During the specified period of time, no significant changes in the surface tension were detected. Values ranging from 72.06 mN/m to 72.74 mN/m were recorded showing no significant variations. The values of the single determinations show no significant difference (less than 5 % between mean values of the two measurement series)
As the determined surface tension of Petroleum Resins (Kendex 0897) was higher than 60 mN/m, the test item can be classified as not surface active.
Executive summary:

Determination of the surface tension of an aqueous solution of Petroleum Resins (Kendex 0897) according to OECD 115 resp. EU A.5

 

Findings and Results:

The surface tension of an aqueous solution of Petroleum Resins (Kendex 0897) was determined as 72.52 ± 0.09 mN/m at 20.2 °C. One measurement was performed for verification (after 60 minutes). No significant changes and thus no significant dependence on time was observed.

 

As these values were higher than 60 mN/m, Petroleum Resins (Kendex 0897) was classified as not surface active.


The surface tension of the negative control lay within the accepted range.

 

The concentration of the test item in the 90% saturated test solution was determined as 1.43 mg test item/L (based on analysis of dissolved organic carbon in the test solution). The saturated solution was obtained from an aqueous solution prepared by shaking 1.00 g/L in water HPLC grade shaking for 72 hours at 20.3 - 23.4 °C in a closed flask at 150 rpm.

Description of key information

The surface tension of an aqueous solution of Petroleum Resins (Kendex 0897) was determined as 72.52 ± 0.09 mN/m at 20.2 °C.

 

Key value for chemical safety assessment

Surface tension:
72.52
in mN/m at 20°C and concentration in mg/L:
1.43

Additional information

The surface tension of an aqueous solution of Petroleum Resins (Kendex 0897) was determined as 72.52 ± 0.09 mN/m at 20.2 °C. One measurement was performed for verification (after 60 minutes). No significant changes and thus no significant dependence on time was observed.

As these values were higher than 60 mN/m, Petroleum Resins (Kendex 0897) was classified as not surface active.

 

The concentration of the test item in the 90% saturated test solution was determined as 1.43 mg test item/L (based on analysis of dissolved organic carbon in the test solution). The saturated solution was obtained from an aqueous solution prepared by shaking 1.00 g/L in water HPLC grade shaking for 72 hours at 20.3 - 23.4 °C in a closed flask at 150 rpm.